昊图公司作为母公司华欣亚洲有限公司在大陆的窗口，还代理进口大型工业设备，如工业压缩机、阀、泵等。
As a window of Wiseworld Asia Group in mainland, Ortho also acts as an agent importing industrial equipment, such as compressors, valves, pumps and so on.
图1为该阀的结构与工作原理示意图。
Figure 1 for the valve structure and working principle diagram.
本文介绍了功率键合图的基本概念，以直动式溢流阀为例，讨论了键合图的建立、状态方程的建立、液压系统动态响应的数字仿真方法。
This article introduces the fundamental concept of power bond graphs, and discusses how to establish bond graphs, status equations, and digital simulation of dynamic responses in a hydraulic system.
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